As a Maiar, Gandalf is essentially a lesser god. Vader would be sure to piss him off with some sort of force choke hold, and Gandalf would unleash his full power on him overloading his cybernetics, if not vaporizing him outright.

Vader with both magic and tech would win. Any of Gandalf's magic could be absorbed by Vader's saber.

We stand at the gates of sacrifice ever ready to go through.What do we want? To die only once our goal is complete! What do we ask? That we may only serve!Who are you?We are the Last Remnants,the unfettered soldiers!

Second of all, darth vader died due to the strongest force in the world, while gandalf just got pawned by a balrog. And vader has the power (force) to live on as a ghost. Truly immortal. And that's pretty standard for jedis. To make a long story sgort. Gandalf would stand with a melted sword, without hands, or head, with about 7 20 tons boulders on hs head. And if he came back, hew would lie there again.

Second of all, darth vader died due to the strongest force in the world, while gandalf just got pawned by a balrog. And vader has the power (force) to live on as a ghost. Truly immortal. And that's pretty standard for jedis. To make a long story sgort. Gandalf would stand with a melted sword, without hands, or head, with about 7 20 tons boulders on hs head. And if he came back, hew would lie there again.

What do you mean Vader is an alien? He's a human who happend to need bionic life support because of horrific injuries.

But you're forgetting that Gandalf (or Olórin to use his proper name) is truly immortal, not in the way that Vader sort of is. Gandalf is a Maia, who are the lesser of the Ainur, who are immortal spirits who entered Valinor at the beginning of time, and are essentially representitives of Eru Ilúvatar on earth.

[/Tolkien nerd]

Thou shalt remember: Warhammer Fantasy armies do NOT have Codices. They have Army Books.